diff --git a/config/settings.py b/config/settings.py
index a2bdb8b..85c717d 100644
--- a/config/settings.py
+++ b/config/settings.py
@@ -115,7 +115,7 @@ AUTH_PASSWORD_VALIDATORS = [
 # Internationalization
 # https://docs.djangoproject.com/en/6.1/topics/i18n/
 
-LANGUAGE_CODE = 'es-es'
+LANGUAGE_CODE = 'es-cl'
 
 TIME_ZONE = 'UTC'
 
diff --git a/expenses/forms.py b/expenses/forms.py
index 58eb77d..9387443 100644
--- a/expenses/forms.py
+++ b/expenses/forms.py
@@ -4,25 +4,40 @@ from .models import Expense, Project, Category, SystemSetting, UserProfile, Docu
 from .chile_regions import REGION_CHOICES, COMMUNE_CHOICES
 
 
+from decimal import Decimal
+import os
+
 class MultipleFileInput(forms.FileInput):
     allow_multiple_selected = True
 
+class MultipleFileField(forms.FileField):
+    def __init__(self, *args, **kwargs):
+        kwargs.setdefault("widget", MultipleFileInput(attrs={'multiple': True, 'accept': 'image/*,.pdf'}))
+        super().__init__(*args, **kwargs)
+
+    def clean(self, data, initial=None):
+        single_file_clean = super().clean
+        if isinstance(data, (list, tuple)):
+            result = [single_file_clean(d, initial) for d in data]
+        else:
+            result = single_file_clean(data, initial)
+        return result
+
 class ExpenseForm(forms.ModelForm):
     date = forms.DateField(
         widget=forms.DateInput(attrs={'type': 'date'}),
         label='Fecha del Gasto'
     )
     
-    amount_clp = forms.DecimalField(
+    amount_clp = forms.CharField(
         label='Monto Neto (CLP)',
         required=True,
-        widget=forms.NumberInput(attrs={'placeholder': 'Ej: 1450000'})
+        widget=forms.TextInput(attrs={'placeholder': 'Ej: 1.450.000'})
     )
     
-    receipt = forms.FileField(
+    receipt = MultipleFileField(
         label='Adjuntar Evidencia(s) (Boleta / Factura)',
-        required=False,
-        widget=MultipleFileInput(attrs={'multiple': True, 'accept': 'image/*,.pdf'})
+        required=False
     )
 
     region = forms.ChoiceField(
@@ -43,16 +58,28 @@ class ExpenseForm(forms.ModelForm):
         required=False
     )
 
-    tax_amount_clp = forms.DecimalField(
+    tax_amount_clp = forms.CharField(
         label='Monto Impuesto (CLP)',
         required=False,
-        widget=forms.NumberInput(attrs={'readonly': 'readonly'})
+        widget=forms.TextInput(attrs={'readonly': 'readonly'})
     )
     
-    total_amount_clp = forms.DecimalField(
+    total_amount_clp = forms.CharField(
         label='Monto Total (CLP)',
         required=False,
-        widget=forms.NumberInput(attrs={'readonly': 'readonly'})
+        widget=forms.TextInput(attrs={'readonly': 'readonly'})
+    )
+
+    new_vendor_rut = forms.CharField(
+        label="RUT Nuevo Proveedor",
+        required=False,
+        widget=forms.TextInput(attrs={'placeholder': 'Ej: 76.543.210-K', 'id': 'id_new_vendor_rut'})
+    )
+
+    new_vendor_name = forms.CharField(
+        label="Nombre / Razón Social Nuevo Proveedor",
+        required=False,
+        widget=forms.TextInput(attrs={'placeholder': 'Ej: IMPORTADORA SPA', 'id': 'id_new_vendor_name'})
     )
 
     class Meta:
@@ -65,6 +92,68 @@ class ExpenseForm(forms.ModelForm):
             'description': forms.Textarea(attrs={'rows': 3, 'placeholder': 'Ej: Carga combustible Copec / Pasajes bus terreno'}),
         }
 
+    def clean_amount_clp(self):
+        data = self.cleaned_data.get('amount_clp', '')
+        if not data:
+            raise forms.ValidationError("Este campo es obligatorio.")
+        data_clean = str(data).replace('.', '').replace(',', '.')
+        try:
+            return Decimal(data_clean)
+        except Exception:
+            raise forms.ValidationError("Ingrese un monto válido (ej: 1.450.000).")
+
+    def clean_tax_amount_clp(self):
+        data = self.cleaned_data.get('tax_amount_clp', '')
+        if not data:
+            return Decimal('0.00')
+        data_clean = str(data).replace('.', '').replace(',', '.')
+        try:
+            return Decimal(data_clean)
+        except Exception:
+            return Decimal('0.00')
+
+    def clean_total_amount_clp(self):
+        data = self.cleaned_data.get('total_amount_clp', '')
+        if not data:
+            return Decimal('0.00')
+        data_clean = str(data).replace('.', '').replace(',', '.')
+        try:
+            return Decimal(data_clean)
+        except Exception:
+            return Decimal('0.00')
+
+    def clean_receipt(self):
+        files = self.files.getlist('receipt')
+        for f in files:
+            ext = os.path.splitext(f.name)[1].lower()
+            if ext not in ['.pdf', '.png', '.jpg', '.jpeg']:
+                raise forms.ValidationError(f"El archivo '{f.name}' no tiene una extensión permitida (PDF, PNG, JPG, JPEG).")
+        return self.cleaned_data.get('receipt')
+
+    def clean(self):
+        cleaned_data = super().clean()
+        new_name = cleaned_data.get('new_vendor_name')
+        new_rut = cleaned_data.get('new_vendor_rut')
+
+        if (new_name and not new_rut) or (new_rut and not new_name):
+            raise forms.ValidationError("Si desea registrar un nuevo proveedor, debe ingresar tanto el RUT como la Razón Social.")
+        return cleaned_data
+
+    def save(self, commit=True):
+        instance = super().save(commit=False)
+        new_name = self.cleaned_data.get('new_vendor_name')
+        new_rut = self.cleaned_data.get('new_vendor_rut')
+        if new_name and new_rut:
+            from .models import Vendor
+            vendor, _ = Vendor.objects.get_or_create(
+                rut=new_rut.strip(),
+                defaults={'name': new_name.strip()}
+            )
+            instance.vendor = vendor
+        if commit:
+            instance.save()
+        return instance
+
 
 class ProjectForm(forms.ModelForm):
     class Meta:
diff --git a/expenses/signals.py b/expenses/signals.py
index e8417ce..26913ae 100644
--- a/expenses/signals.py
+++ b/expenses/signals.py
@@ -11,7 +11,7 @@ def expense_saved(sender, instance, created, **kwargs):
     
     expense_data = {
         'id': instance.id,
-        'amount': str(instance.amount),
+        'amount': str(instance.amount_clp),
         'category': instance.category.name if instance.category else None,
         'project': instance.project.name if instance.project else None,
         'user': instance.user.username if instance.user else None,
diff --git a/expenses/urls.py b/expenses/urls.py
index 77de5c0..52a8988 100644
--- a/expenses/urls.py
+++ b/expenses/urls.py
@@ -18,6 +18,7 @@ urlpatterns = [
     
     # Export / Import
     path('gastos/exportar/csv/', views.export_expenses_csv, name='export_csv'),
+    path('gastos/exportar/transferencias/', views.export_bank_transfer_csv, name='export_bank_transfer_csv'),
     
     path('proyectos/', views.project_list, name='project_list'),
     
diff --git a/expenses/views.py b/expenses/views.py
index 29e7257..7d1bd00 100644
--- a/expenses/views.py
+++ b/expenses/views.py
@@ -343,6 +343,59 @@ def export_expenses_csv(request):
     return response
 
 
+@login_required
+@role_required('Administrador', 'Administrador Finanzas')
+def export_bank_transfer_csv(request):
+    # Get all expenses requested for payment that are linked to a vendor
+    pending_expenses = Expense.objects.filter(
+        approval_status=ApprovalStatusEnum.SOLICITADO_FINANZAS, 
+        vendor__isnull=False
+    )
+    
+    # Group debts by vendor to perform single bank transfer per supplier
+    debts = pending_expenses.values(
+        'vendor__id', 'vendor__rut', 'vendor__name', 'vendor__bank', 'vendor__account_type', 'vendor__account_number'
+    ).annotate(
+        total_clp=Sum('amount_clp'),
+        total_usd=Sum('amount_usd'),
+        expense_count=Count('id')
+    ).order_by('vendor__name')
+
+    response = HttpResponse(content_type='text/csv')
+    response['Content-Disposition'] = f'attachment; filename="Nomina_Transferencias_{date.today()}.csv"'
+
+    # Write BOM for Excel Spanish compatibility
+    response.write('\ufeff'.encode('utf-8'))
+
+    writer = csv.writer(response, delimiter=';')
+    writer.writerow([
+        'RUT Proveedor', 'Nombre / Razón Social', 'Banco', 'Tipo Cuenta', 
+        'Número Cuenta', 'Monto Transferir (CLP)', 'Monto Transferir (USD)', 
+        'Comprobantes Pendientes', 'Glosa / Comentario'
+    ])
+
+    for debt in debts:
+        writer.writerow([
+            debt['vendor__rut'],
+            debt['vendor__name'],
+            debt['vendor__bank'] or 'No Registrado',
+            debt['vendor__account_type'] or 'No Registrado',
+            debt['vendor__account_number'] or 'No Registrado',
+            int(debt['total_clp']),
+            round(debt['total_usd'], 2),
+            debt['expense_count'],
+            'Pago Facturas Pendientes EFINTEL ERP'
+        ])
+
+    AuditLog.objects.create(
+        user=request.user,
+        action="EXPORT_BANK_TRANSFER",
+        description="Se exportó la nómina bancaria de transferencias a proveedores."
+    )
+
+    return response
+
+
 @login_required
 def project_list(request):
     projects = Project.objects.annotate(
diff --git a/scratch/test_expense_integration.py b/scratch/test_expense_integration.py
new file mode 100644
index 0000000..f0bd418
--- /dev/null
+++ b/scratch/test_expense_integration.py
@@ -0,0 +1,158 @@
+import os
+import sys
+import django
+from django.test import Client
+from django.core.files.uploadedfile import SimpleUploadedFile
+from decimal import Decimal
+
+# Set up Django environment
+sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'config.settings')
+django.setup()
+
+from django.conf import settings
+if 'testserver' not in settings.ALLOWED_HOSTS:
+    settings.ALLOWED_HOSTS.append('testserver')
+
+from django.contrib.auth.models import User
+from expenses.models import Project, Category, Vendor, Expense, Document, SystemSetting, CurrencyEnum, TaxTypeEnum, ApprovalStatusEnum
+
+def run_test():
+    print("=" * 60)
+    print("EFINTEL ERP — Expense Creation Flow Integration Test")
+    print("=" * 60)
+
+    # 1. Setup client and login
+    print("Step 1: Setting up Django test Client & Authenticating...")
+    client = Client()
+    admin_user = User.objects.filter(username='admin').first()
+    if not admin_user:
+        print("Admin user 'admin' not found in database. Creating user...")
+        admin_user = User.objects.create_superuser('admin', 'admin@example.com', 'admin')
+        print("Admin user created successfully.")
+    
+    client.force_login(admin_user)
+    print(f"Authenticated successfully as: {admin_user.username} (ID: {admin_user.id})")
+
+    # Fetch required objects
+    print("\nFetching Project (PRY-101) and Category (1201)...")
+    project = Project.objects.filter(code='PRY-101').first()
+    if not project:
+        raise ValueError("Project PRY-101 not found! Please run project seed scripts first.")
+    print(f"Found Project: {project.code} - '{project.name}' (ID: {project.id})")
+
+    category = Category.objects.filter(code='1201').first()
+    if not category:
+        raise ValueError("Category 1201 not found! Please run category seed scripts first.")
+    print(f"Found Category: {category.code} - '{category.name}' (ID: {category.id})")
+
+    # Fetch/create SystemSetting to get exchange rate
+    setting, created = SystemSetting.objects.get_or_create(id=1, defaults={'usd_exchange_rate': 950.0})
+    usd_rate = setting.usd_exchange_rate
+    print(f"System setting exchange rate is: {usd_rate}")
+
+    # Prepare Mock Files
+    print("\nPreparing mock evidence files for upload...")
+    file1 = SimpleUploadedFile("receipt1.pdf", b"pdf content mock", content_type="application/pdf")
+    file2 = SimpleUploadedFile("receipt2.png", b"png content mock", content_type="image/png")
+
+    # 2. Prepare POST data
+    print("\nStep 2: Preparing POST request data for '/gastos/nuevo/'...")
+    post_data = {
+        'project': project.id,
+        'category': category.id,
+        'amount_clp': '2.500.000',
+        'tax_type': TaxTypeEnum.IVA_19,
+        'tax_amount_clp': '475.000',  # 19% of 2.500.000
+        'total_amount_clp': '2.975.000', # 2.500.000 + 475.000
+        'currency': CurrencyEnum.CLP,
+        'responsible_person': admin_user.id,
+        'date': '2026-08-21',
+        'description': 'Servicios de consultoría de prototipado rápido y PCBs',
+        'new_vendor_rut': '77.888.999-5',
+        'new_vendor_name': 'CONEXIONES SPA',
+        'toggle-new-vendor': 'on',
+        'region': 'Región Metropolitana',
+        'comuna': 'Santiago',
+        'receipt': [file1, file2],
+    }
+
+    # Clean existing data to avoid conflicts and guarantee clean assertion
+    print("Cleaning any existing vendor/expense with target RUT to avoid duplication conflicts...")
+    Vendor.objects.filter(rut='77.888.999-5').delete()
+
+    # 3. Execute POST request
+    print("\nStep 3: Executing POST request to '/gastos/nuevo/'...")
+    response = client.post('/gastos/nuevo/', post_data, follow=False)
+
+    # 4. Verify results
+    print("\nStep 4: Verifying results...")
+    
+    # 4.1 Response Status and Redirect
+    status_code = response.status_code
+    location = response.get('Location', '')
+    print(f"  [Assertion 1] Response Status Code: {status_code} (Expected: 302)")
+    print(f"  [Assertion 1] Redirect Location: {location} (Expected: /gastos/)")
+    assert status_code == 302, f"Expected status code 302, got {status_code}"
+    assert '/gastos/' in location, f"Expected redirect to '/gastos/', got '{location}'"
+    print("  => Response redirect validation: PASSED")
+
+    # 4.2 New Vendor creation
+    vendor = Vendor.objects.filter(rut='77.888.999-5').first()
+    assert vendor is not None, "Vendor was not created!"
+    print(f"  [Assertion 2] Vendor Created: RUT={vendor.rut}, Name='{vendor.name}' (Expected: 'CONEXIONES SPA')")
+    assert vendor.name == 'CONEXIONES SPA', f"Expected name 'CONEXIONES SPA', got '{vendor.name}'"
+    print("  => Vendor DB validation: PASSED")
+
+    # 4.3 New Expense creation
+    expense = Expense.objects.filter(vendor=vendor, date='2026-08-21').first()
+    assert expense is not None, "Expense was not created!"
+    print(f"  [Assertion 3] Expense Created with net amount={expense.amount_clp} CLP (Expected: 2500000.00 CLP)")
+    assert expense.amount_clp == Decimal('2500000.00'), f"Expected net amount 2500000.00, got {expense.amount_clp}"
+    print("  => Expense DB amount validation: PASSED")
+
+    # 4.4 Associated Document verification
+    documents = list(expense.documents.all())
+    print(f"  [Assertion 4] Associated Documents Count: {len(documents)} (Expected: 2)")
+    assert len(documents) == 2, f"Expected 2 documents, found {len(documents)}"
+    filenames = [os.path.basename(doc.file.name) for doc in documents]
+    print(f"  [Assertion 4] Document filenames in DB: {filenames} (Expected containing 'receipt1.pdf' and 'receipt2.png')")
+    assert any("receipt1" in fn and fn.endswith(".pdf") for fn in filenames), "receipt1.pdf not found in documents"
+    assert any("receipt2" in fn and fn.endswith(".png") for fn in filenames), "receipt2.png not found in documents"
+    print("  => Documents validation: PASSED")
+
+    # 4.5 USD conversion calculation
+    expected_usd = Decimal('2500000.00') / usd_rate
+    print(f"  [Assertion 5] Expense USD Amount in DB: {expense.amount_usd} (Expected: {expected_usd})")
+    assert abs(expense.amount_usd - expected_usd) < Decimal('0.01'), f"USD conversion mismatch: DB={expense.amount_usd}, Expected={expected_usd}"
+    print("  => USD exchange rate conversion validation: PASSED")
+
+    # 5. Test bank transfer export
+    print("\nStep 5: Testing 'export_bank_transfer_csv' endpoint...")
+    # Change expense status to SOLICITADO_FINANZAS to make sure it is exported
+    expense.approval_status = ApprovalStatusEnum.SOLICITADO_FINANZAS
+    expense.save()
+
+    export_response = client.get('/gastos/exportar/transferencias/')
+    print(f"  [Assertion 6] Export Status Code: {export_response.status_code} (Expected: 200)")
+    assert export_response.status_code == 200, f"Expected 200, got {export_response.status_code}"
+    
+    # Decode using utf-8-sig to automatically handle BOM if present, or manually assert it
+    content_raw = export_response.content
+    assert content_raw.startswith(b'\xef\xbb\xbf'), "BOM bytes not found at the start of CSV!"
+    content_str = content_raw.decode('utf-8')
+    assert 'RUT Proveedor' in content_str, "CSV header mismatch!"
+    assert 'CONEXIONES SPA' in content_str, "CONEXIONES SPA should be present in the export!"
+    print("  => Bank Transfer CSV validation: PASSED")
+
+    print("\n" + "=" * 60)
+    print("🎉 ALL INTEGRATION VALIDATION STEPS PASSED SUCCESSFULLY! 🎉")
+    print("=" * 60)
+
+if __name__ == '__main__':
+    try:
+        run_test()
+    except Exception as e:
+        import traceback
+        traceback.print_exc()
+        sys.exit(1)
diff --git a/templates/expenses/accounts_payable.html b/templates/expenses/accounts_payable.html
index 0c4aa1c..c4c626e 100644
--- a/templates/expenses/accounts_payable.html
+++ b/templates/expenses/accounts_payable.html
@@ -2,11 +2,18 @@
 {% load humanize %}
 
 {% block content %}
-<div class="view-header">
+<div class="view-header" style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.5rem;">
     <div class="view-title">
         <h2>Cuentas por Pagar (CXP)</h2>
         <p>Consolidado de deudas por proveedor en estado Solicitado a Finanzas.</p>
     </div>
+    {% if debts %}
+    <div>
+        <a href="{% url 'export_bank_transfer_csv' %}" class="btn-primary" style="background: var(--efintel-blue); text-decoration: none; display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.6rem 1rem;">
+            <i data-lucide="download" style="width:16px;"></i> Exportar Nómina de Transferencias (CSV)
+        </a>
+    </div>
+    {% endif %}
 </div>
 
 <section class="main-content">
diff --git a/templates/expenses/dashboard.html b/templates/expenses/dashboard.html
index 5ac1c67..8bad793 100644
--- a/templates/expenses/dashboard.html
+++ b/templates/expenses/dashboard.html
@@ -97,6 +97,15 @@
             <td style="font-weight:600; color:var(--efintel-dark);">
                 {{ expense.description|truncatechars:50 }}<br>
                 <span style="font-size:0.65rem; color:var(--efintel-gray);">{{ expense.responsible_person.username|default:expense.user.username }}</span>
+                {% if expense.documents.all %}
+                <div style="margin-top: 0.25rem; display: flex; flex-direction: column; gap: 0.2rem;">
+                    {% for doc in expense.documents.all %}
+                    <a href="{{ doc.file.url }}" target="_blank" style="font-size:0.65rem; color:var(--efintel-blue); text-decoration:none; display:inline-flex; align-items:center; gap:0.2rem;" title="{{ doc.title|default:doc.file.name }}">
+                        <i data-lucide="paperclip" style="width:10px;"></i> {{ doc.title|default:doc.file.name|truncatechars:25 }}
+                    </a>
+                    {% endfor %}
+                </div>
+                {% endif %}
             </td>
             <td class="amount-cell">
               <div>${{ expense.amount_clp|floatformat:"0"|intcomma }} CLP</div>
diff --git a/templates/expenses/expense_form.html b/templates/expenses/expense_form.html
index 55ebea4..4c2c42f 100644
--- a/templates/expenses/expense_form.html
+++ b/templates/expenses/expense_form.html
@@ -90,31 +90,66 @@
                 <div class="form-group">
                     <label for="{{ form.vendor.id_for_label }}" style="font-weight: 600; font-size: 0.85rem; color: var(--efintel-dark);">Proveedor (Opcional)</label>
                     {{ form.vendor }}
+                    <div style="margin-top: 0.5rem;">
+                        <label style="font-size: 0.75rem; display: flex; align-items: center; gap: 0.35rem; cursor: pointer; color: var(--efintel-blue); font-weight: 600;">
+                            <input type="checkbox" id="toggle-new-vendor" style="width: auto; margin: 0; cursor: pointer;"> Registrar un nuevo proveedor
+                        </label>
+                    </div>
                     {% if form.vendor.errors %}<div style="color: var(--efintel-danger); font-size: 0.75rem; margin-top: 4px;">{{ form.vendor.errors }}</div>{% endif %}
                 </div>
             </div>
 
+            <div id="new-vendor-fields" style="display: none; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin-bottom: 1.5rem; background: #f0fdf4; padding: 1.25rem; border-radius: 6px; border: 1px solid #bbf7d0; box-shadow: inset 0 2px 4px 0 rgba(0, 0, 0, 0.05);">
+                <div class="form-group">
+                    <label for="id_new_vendor_rut" style="font-weight: 600; font-size: 0.85rem; color: #166534;">RUT del Nuevo Proveedor</label>
+                    {{ form.new_vendor_rut }}
+                    {% if form.new_vendor_rut.errors %}<div style="color: var(--efintel-danger); font-size: 0.75rem; margin-top: 4px;">{{ form.new_vendor_rut.errors }}</div>{% endif %}
+                </div>
+                <div class="form-group">
+                    <label for="id_new_vendor_name" style="font-weight: 600; font-size: 0.85rem; color: #166534;">Nombre / Razón Social del Nuevo Proveedor</label>
+                    {{ form.new_vendor_name }}
+                    {% if form.new_vendor_name.errors %}<div style="color: var(--efintel-danger); font-size: 0.75rem; margin-top: 4px;">{{ form.new_vendor_name.errors }}</div>{% endif %}
+                </div>
+            </div>
+
             <div class="form-group" style="margin-bottom: 1.5rem;">
                 <label for="{{ form.description.id_for_label }}" style="font-weight: 600; font-size: 0.85rem; color: var(--efintel-dark);">Detalle de Imputación (Justificación)</label>
                 {{ form.description }}
                 {% if form.description.errors %}<div style="color: var(--efintel-danger); font-size: 0.75rem; margin-top: 4px;">{{ form.description.errors }}</div>{% endif %}
             </div>
 
-            <div class="form-group" style="margin-bottom: 1.5rem; background: #f8fafc; padding: 1.5rem; border-radius: 6px; border: 1px dashed var(--efintel-blue);">
-                <label for="{{ form.receipt.id_for_label }}" style="font-weight: 600; font-size: 0.85rem; color: var(--efintel-petroleum); display:flex; align-items:center; gap:0.3rem;"><i data-lucide="paperclip" style="width:14px;"></i> Adjuntar Evidencia(s) (Boletas / Facturas)</label>
-                {{ form.receipt }}
-                <div id="new-files-list" style="margin-top: 0.75rem; display: flex; flex-direction: column; gap: 0.4rem;"></div>
-                <small style="color: var(--efintel-gray); font-size: 0.7rem; display:block; margin-top:0.3rem; margin-bottom: 0.75rem;">Puedes seleccionar múltiples archivos (imágenes o PDF).</small>
+            <div class="form-group" style="margin-bottom: 1.5rem; background: #f8fafc; padding: 1.5rem; border-radius: 6px; border: 1px solid var(--efintel-border);">
+                <label style="font-weight: 600; font-size: 0.85rem; color: var(--efintel-petroleum); display:flex; align-items:center; gap:0.3rem; margin-bottom: 0.75rem;"><i data-lucide="paperclip" style="width:14px;"></i> Evidencias Adjuntas (Boletas / Facturas)</label>
+                
+                <!-- Drag and Drop Zone Container -->
+                <div id="drop-zone" style="border: 2px dashed var(--efintel-blue); border-radius: 6px; padding: 2rem; text-align: center; background: white; cursor: pointer; transition: all 0.3s; margin-bottom: 0.75rem; display: flex; flex-direction: column; align-items: center; justify-content: center;">
+                    <i data-lucide="upload-cloud" style="width: 36px; height: 36px; color: var(--efintel-blue); margin-bottom: 0.5rem; transition: transform 0.3s;"></i>
+                    <p style="margin: 0; font-size: 0.85rem; font-weight: 600; color: var(--efintel-petroleum);">Arrastre sus boletas/facturas aquí o haga clic para buscar</p>
+                    <span style="font-size: 0.7rem; color: var(--efintel-gray); display: block; margin-top: 0.25rem;">Formatos aceptados: PDF, PNG, JPG, JPEG (Múltiple)</span>
+                </div>
+
+                <!-- Hidden native input -->
+                <div style="display: none;">
+                    {{ form.receipt }}
+                </div>
+                
+                <!-- Live Queue files list -->
+                <div id="new-files-list" style="margin-top: 0.75rem; display: flex; flex-direction: column; gap: 0.5rem;"></div>
+                
                 {% if form.receipt.errors %}<div style="color: var(--efintel-danger); font-size: 0.75rem; margin-top: 4px;">{{ form.receipt.errors }}</div>{% endif %}
                 
                 {% if form.instance.pk and form.instance.documents.all %}
-                    <div style="margin-top: 1rem; border-top: 1px solid #e2e8f0; padding-top: 0.75rem;">
+                    <div style="margin-top: 1.25rem; border-top: 1px solid #e2e8f0; padding-top: 0.75rem;">
                         <strong style="font-size: 0.8rem; color: var(--efintel-petroleum); display: block; margin-bottom: 0.5rem;">Documentos Adjuntos Actuales:</strong>
                         <div style="display: flex; flex-direction: column; gap: 0.5rem;">
                             {% for doc in form.instance.documents.all %}
                                 <div class="document-row" id="doc-row-{{ doc.id }}" style="display: flex; justify-content: space-between; align-items: center; background: white; padding: 0.5rem 0.75rem; border: 1px solid #e2e8f0; border-radius: 4px; font-size: 0.8rem;">
-                                    <span style="font-weight: 500; color: var(--efintel-dark); display: flex; align-items: center; gap: 0.3rem;">
-                                        <i data-lucide="file-text" style="width: 14px; color: var(--efintel-blue);"></i>
+                                    <span style="font-weight: 500; color: var(--efintel-dark); display: flex; align-items: center; gap: 0.5rem;">
+                                        {% if ".pdf" in doc.file.name|lower %}
+                                            <i data-lucide="file-text" style="width: 18px; color: #ef4444;"></i>
+                                        {% else %}
+                                            <img src="{{ doc.file.url }}" style="width: 24px; height: 24px; object-fit: cover; border-radius: 3px; border: 1px solid #cbd5e1;" alt="thumbnail">
+                                        {% endif %}
                                         <a href="{{ doc.file.url }}" target="_blank" style="color: var(--efintel-blue); text-decoration: none;">{{ doc.title|default:doc.file.name }}</a>
                                     </span>
                                     <button type="button" onclick="deleteDocument(event, {{ doc.id }})" style="background: none; border: none; color: var(--efintel-danger); cursor: pointer; display: flex; align-items: center; padding: 0.2rem;" title="Eliminar evidencia">
@@ -175,8 +210,17 @@
     const taxAmountInput = document.getElementById('id_tax_amount_clp');
     const totalAmountInput = document.getElementById('id_total_amount_clp');
 
+    function formatNumber(num) {
+        return num.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ".");
+    }
+
+    function cleanNumberString(str) {
+        return str.replace(/\./g, '');
+    }
+
     function calculateTaxes() {
-        const amount = parseFloat(amountInput.value) || 0;
+        const cleanVal = cleanNumberString(amountInput.value);
+        const amount = parseFloat(cleanVal) || 0;
         const taxType = taxTypeSelect.value;
         let taxAmount = 0;
 
@@ -186,14 +230,35 @@
             taxAmount = amount * 0.1375;
         }
 
-        taxAmountInput.value = taxAmount.toFixed(0);
-        totalAmountInput.value = (amount + taxAmount).toFixed(0);
+        taxAmountInput.value = formatNumber(Math.round(taxAmount));
+        totalAmountInput.value = formatNumber(Math.round(amount + taxAmount));
     }
 
-    amountInput.addEventListener('input', calculateTaxes);
+    amountInput.addEventListener('input', (e) => {
+        let cursorPosition = e.target.selectionStart;
+        const oldLength = e.target.value.length;
+
+        const cleanVal = cleanNumberString(e.target.value).replace(/\D/g, '');
+        if (cleanVal) {
+            e.target.value = formatNumber(cleanVal);
+        } else {
+            e.target.value = '';
+        }
+
+        const newLength = e.target.value.length;
+        cursorPosition = cursorPosition + (newLength - oldLength);
+        e.target.setSelectionRange(cursorPosition, cursorPosition);
+
+        calculateTaxes();
+    });
+
     taxTypeSelect.addEventListener('change', calculateTaxes);
 
-    // Initial calculation
+    // Initial formatting on load
+    if (amountInput.value) {
+        const cleanVal = cleanNumberString(amountInput.value).replace(/\D/g, '');
+        amountInput.value = formatNumber(cleanVal);
+    }
     calculateTaxes();
 
     // Custom Searchable Dropdown for Category
@@ -437,19 +502,71 @@
         });
     }
 
-    // Client-side Upload File Deletion Queue using DataTransfer
+    // Client-side Upload File Deletion Queue using DataTransfer + Drag and Drop
     const fileInput = document.getElementById('id_receipt');
     const newFilesList = document.getElementById('new-files-list');
+    const dropZone = document.getElementById('drop-zone');
 
-    if (fileInput && newFilesList) {
+    if (fileInput && newFilesList && dropZone) {
         let dt = new DataTransfer();
 
+        // Clicking the drop zone triggers the hidden file input
+        dropZone.addEventListener('click', () => {
+            fileInput.click();
+        });
+
+        // Highlight drop zone on drag hover
+        ['dragenter', 'dragover'].forEach(eventName => {
+            dropZone.addEventListener(eventName, (e) => {
+                e.preventDefault();
+                e.stopPropagation();
+                dropZone.style.border = '2px dashed var(--efintel-blue)';
+                dropZone.style.background = 'var(--efintel-light)';
+                const icon = dropZone.querySelector('i');
+                if (icon) icon.style.transform = 'scale(1.2)';
+            }, false);
+        });
+
+        ['dragleave', 'drop'].forEach(eventName => {
+            dropZone.addEventListener(eventName, (e) => {
+                e.preventDefault();
+                e.stopPropagation();
+                dropZone.style.border = '2px dashed var(--efintel-blue)';
+                dropZone.style.background = 'white';
+                const icon = dropZone.querySelector('i');
+                if (icon) icon.style.transform = 'scale(1)';
+            }, false);
+        });
+
+        // Handle dropped files
+        dropZone.addEventListener('drop', (e) => {
+            const files = e.dataTransfer.files;
+            if (files.length > 0) {
+                for (let i = 0; i < files.length; i++) {
+                    const f = files[i];
+                    // Validate file type before putting in queue (extensions: pdf, png, jpg, jpeg)
+                    const ext = f.name.split('.').pop().toLowerCase();
+                    if (['pdf', 'png', 'jpg', 'jpeg'].includes(ext)) {
+                        dt.items.add(f);
+                    } else {
+                        Swal.fire({
+                            icon: 'error',
+                            title: 'Archivo no permitido',
+                            text: `El archivo "${f.name}" no es una evidencia válida (PDF, PNG, JPG, JPEG).`,
+                            confirmButtonColor: 'var(--efintel-blue)'
+                        });
+                    }
+                }
+                fileInput.files = dt.files;
+                renderNewFiles();
+            }
+        });
+
+        // Handle standard file selection
         fileInput.addEventListener('change', () => {
-            // Append newly selected files to our ongoing list
             for (let i = 0; i < fileInput.files.length; i++) {
                 dt.items.add(fileInput.files[i]);
             }
-            // Update input files list
             fileInput.files = dt.files;
             renderNewFiles();
         });
@@ -479,11 +596,42 @@
                 row.style.border = '1px solid var(--efintel-border)';
                 row.style.marginBottom = '0.3rem';
 
+                // File Detail Info with preview
+                const infoWrapper = document.createElement('div');
+                infoWrapper.style.display = 'flex';
+                infoWrapper.style.alignItems = 'center';
+                infoWrapper.style.gap = '0.5rem';
+
+                // Check file extension
+                const ext = file.name.split('.').pop().toLowerCase();
+                if (['png', 'jpg', 'jpeg'].includes(ext)) {
+                    // Render image thumbnail
+                    const img = document.createElement('img');
+                    img.src = URL.createObjectURL(file);
+                    img.style.width = '24px';
+                    img.style.height = '24px';
+                    img.style.objectFit = 'cover';
+                    img.style.borderRadius = '3px';
+                    img.style.border = '1px solid #cbd5e1';
+                    img.onload = () => URL.revokeObjectURL(img.src); // Free memory
+                    infoWrapper.appendChild(img);
+                } else if (ext === 'pdf') {
+                    // Render PDF file icon
+                    const pdfIcon = document.createElement('span');
+                    pdfIcon.innerHTML = `<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="#ef4444" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M14.5 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V7.5L14.5 2z"></path><polyline points="14 2 14 8 20 8"></polyline><line x1="16" y1="13" x2="8" y2="13"></line><line x1="16" y1="17" x2="8" y2="17"></line><polyline points="10 9 9 9 8 9"></polyline></svg>`;
+                    infoWrapper.appendChild(pdfIcon);
+                } else {
+                    const defaultIcon = document.createElement('span');
+                    defaultIcon.innerHTML = `<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="var(--efintel-blue)" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21.44 11.05l-9.19 9.19a6 6 0 0 1-8.49-8.49l9.19-9.19a4 4 0 0 1 5.66 5.66l-9.2 9.19a2 2 0 0 1-2.83-2.83l8.49-8.48"></path></svg>`;
+                    infoWrapper.appendChild(defaultIcon);
+                }
+
                 const nameSpan = document.createElement('span');
                 nameSpan.style.color = 'var(--efintel-petroleum)';
                 nameSpan.style.fontWeight = '600';
                 nameSpan.textContent = `${file.name} (${(file.size / 1024).toFixed(1)} KB)`;
-                row.appendChild(nameSpan);
+                infoWrapper.appendChild(nameSpan);
+                row.appendChild(infoWrapper);
 
                 const deleteBtn = document.createElement('button');
                 deleteBtn.type = 'button';
@@ -514,5 +662,95 @@
             });
         }
     }
+
+    // Toggle logic for unregistered vendor inputs
+    const toggleNewVendor = document.getElementById('toggle-new-vendor');
+    const newVendorFields = document.getElementById('new-vendor-fields');
+    const originalVendorSelect = document.getElementById('id_vendor');
+
+    if (toggleNewVendor && newVendorFields) {
+        toggleNewVendor.addEventListener('change', (e) => {
+            if (e.target.checked) {
+                newVendorFields.style.display = 'grid';
+                if (originalVendorSelect) {
+                    originalVendorSelect.value = '';
+                }
+            } else {
+                newVendorFields.style.display = 'none';
+                document.getElementById('id_new_vendor_rut').value = '';
+                document.getElementById('id_new_vendor_name').value = '';
+            }
+        });
+    }
+</script>
+{% endblock %}
+
+{% block extra_js %}
+<script src="https://cdn.jsdelivr.net/npm/sweetalert2@11"></script>
+<script>
+    document.addEventListener('DOMContentLoaded', () => {
+        // Backend Validation SweetAlert Popups
+        {% if form.errors or form.non_field_errors %}
+        Swal.fire({
+            icon: 'error',
+            title: 'Error de Validación',
+            html: `<p style="text-align: left; margin-bottom: 0.5rem; font-weight:600;">Ocurrieron errores al procesar el formulario:</p>
+                   <ul style="text-align: left; margin-top: 0; color: #ef4444; font-size: 0.85rem;">
+                       {% for field, errors in form.errors.items %}
+                           <li><strong>{{ field|capfirst }}:</strong> {{ errors|join:", " }}</li>
+                       {% endfor %}
+                       {% for err in form.non_field_errors %}
+                           <li>{{ err }}</li>
+                       {% endfor %}
+                   </ul>`,
+            confirmButtonColor: 'var(--efintel-blue)'
+        });
+        {% endif %}
+
+        // Form Submit Frontend Validation
+        const formEl = document.querySelector('form');
+        if (formEl) {
+            formEl.addEventListener('submit', (e) => {
+                let missing = [];
+
+                const project = document.getElementById('id_project').value;
+                const category = document.getElementById('id_category').value;
+                const amount = document.getElementById('id_amount_clp').value.trim();
+                const date = document.getElementById('id_date').value;
+                const desc = document.getElementById('id_description').value.trim();
+                const responsible = document.getElementById('id_responsible_person').value;
+
+                if (!project) missing.push('Centro de Costo / Proyecto');
+                if (!category) missing.push('Categoría Contable');
+                if (!amount) missing.push('Monto Neto (CLP)');
+                if (!date) missing.push('Fecha de Gasto');
+                if (!desc) missing.push('Detalle de Imputación (Justificación)');
+                if (!responsible) missing.push('Responsable Solicitante');
+
+                // If toggle new vendor is checked
+                const toggleNewVendor = document.getElementById('toggle-new-vendor');
+                if (toggleNewVendor && toggleNewVendor.checked) {
+                    const newRut = document.getElementById('id_new_vendor_rut').value.trim();
+                    const newName = document.getElementById('id_new_vendor_name').value.trim();
+                    if (!newRut) missing.push('RUT del Nuevo Proveedor');
+                    if (!newName) missing.push('Nombre / Razón Social del Nuevo Proveedor');
+                }
+
+                if (missing.length > 0) {
+                    e.preventDefault();
+                    Swal.fire({
+                        icon: 'warning',
+                        title: 'Campos Obligatorios Incompletos',
+                        html: `<p style="text-align: left; margin-bottom: 0.5rem;">Por favor, rellene los siguientes campos requeridos antes de enviar:</p>
+                               <ul style="text-align: left; margin-top: 0; font-size: 0.85rem;">
+                                   ${missing.map(f => `<li><strong>${f}</strong></li>`).join('')}
+                               </ul>`,
+                        confirmButtonColor: 'var(--efintel-blue)'
+                    });
+                    return false;
+                }
+            });
+        }
+    });
 </script>
 {% endblock %}
diff --git a/templates/expenses/expense_list.html b/templates/expenses/expense_list.html
index 6a1bb6f..e7940d4 100644
--- a/templates/expenses/expense_list.html
+++ b/templates/expenses/expense_list.html
@@ -67,8 +67,14 @@
                         <td style="font-weight:600; color:var(--efintel-dark); font-size: 0.85rem;">
                             {{ expense.description|truncatechars:40 }}<br>
                             <span style="font-size:0.65rem; color:var(--efintel-gray);">{{ expense.responsible_person.username|default:expense.user.username }}</span>
-                            {% if expense.documents.first %}
-                            <br><a href="{{ expense.documents.first.file.url }}" target="_blank" style="font-size:0.65rem; color:var(--efintel-blue); text-decoration:none; display:inline-flex; align-items:center; gap:0.2rem; margin-top:0.2rem;"><i data-lucide="paperclip" style="width:10px;"></i> Evidencia Adjunta</a>
+                            {% if expense.documents.all %}
+                            <div style="margin-top: 0.25rem; display: flex; flex-direction: column; gap: 0.2rem;">
+                                {% for doc in expense.documents.all %}
+                                <a href="{{ doc.file.url }}" target="_blank" style="font-size:0.65rem; color:var(--efintel-blue); text-decoration:none; display:inline-flex; align-items:center; gap:0.2rem;" title="{{ doc.title|default:doc.file.name }}">
+                                    <i data-lucide="paperclip" style="width:10px;"></i> {{ doc.title|default:doc.file.name|truncatechars:25 }}
+                                </a>
+                                {% endfor %}
+                            </div>
                             {% endif %}
                         </td>
                         <td class="amount-cell">